js 滚动视差

 

直接复制代码粘贴到HTML页面中，图片和路径自己修改

 

第一种效果：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        div {
            width: 100%;
            height: 500px;
            border-bottom: 2px solid red;
        }

        div:nth-child(3) {
            background-image: url(bg1.jpg);
            background-size: cover;
            background-position: center;  
        }
    </style>
</head>

<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>


    <script>
        const divEl = document.querySelector(`div:nth-child(3)`)
        window.addEventListener("scroll", () => {
            //getBoundingClientRect方法返回元素的大小及其相对于视口的位置
            const top = divEl.getBoundingClientRect().top;
            const bottom = divEl.getBoundingClientRect().bottom;

            if (bottom >= 0 && top <= window.innerHeight) {
                divEl.style.backgroundPosition = `center calc(50% - ${bottom / 2}px)`;
            }
        })
    </script>
</body>

</html>

第二种效果：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        .box {
            width: 100%;
            height: 500px;
            border-bottom: 2px solid red;
            background-color: #CCC;
        }

        .box1Bg {
            position: fixed;
            width: 100%;
            pointer-events: none;
            background-image: url(bg3.jpg);
            background-position: 50% 50%;
            background-repeat: no-repeat;
            background-size: cover;
            background-color: rgba(0, 0, 0, 0);
            height: 100%;
            top: 0px;
            z-index: -1;
        }

        .box:nth-child(1) {
            color: white;
            text-align: center;
            font-size: 30px;
            background-color: transparent;
        }


        .box:nth-child(4) {
            color: white;
            text-align: center;
            font-size: 30px;
            background-color: transparent;
        }
    </style>
</head>

<body>
    <div class="box">
        <span>啊撒大苏打实打实大苏打实打实大苏打上</span>
        <div class="box1Bg"></div>
    </div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box">
        <span>第四个内容</span>

        <div style="background-image: none; position: relative;">
            <div style="position: absolute; inset: 0px; clip: rect(-40px, 1912px, 617px, 0px);">
                <div style="position:fixed;top:0;left:0;width:1912px;bottom:0;z-index:-1;pointer-events:none">
                    <div
                        style="position: absolute; width: 100%; pointer-events: none;
                         background-image: url(bg1.jpg); background-position: 50% 50%; background-repeat: no-repeat; background-size: cover; background-color: rgba(0, 0, 0, 0); height: 100%; top: 0px;">
                    </div>
                </div>
            </div>
        </div>

    </div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>



</body>

</html>

 

HTML效果：

 

posted @ 2021-09-26 16:30  暴走漫画  阅读(112)  评论(0)  编辑  收藏  举报